Remote conteol system



Oct. 6, 1936. G. A. BURNS ET AL REMOTE CONTROL SYSTEM Filed OGC. 6, 1932 2 Sheets-Sheet 1 65e/eas ARTHUR BUR/vs PERO# FRANK Gz//wv/NG Oct. 6, 1936. G, A BURNS ET AL 2,056,770

REMOTE CONTROL SYSTEM v v y Filed Oct. 6, 1932 2 Sheets-Sheet 2 POL/IR RELA V Poule REL/1y RETARUEH RELAY -fNv-'A/roRs- GEO/feas ARTHUR BUR/vs Pmcr FRANK Gu/vN/NG A Tfr:

Patented Oct. 6, 1936 UNITED STATES REMOTE CONTROL SYSTEM George Arthur Burns an Liverpool, England,

Telephone and rielegr d Percy Frank Gunning,

assignors to Associated aph Company, Chicago,

Ill., a corporation of Delaware Application October 6 1932, Serial No. 636,510

In Great Britain October 9, 1931 5 Claims.

The present invention relates to improvements in or relating to remote control systems.

In certain systems it is necessary before the circuit breakers are closed to synchronize the generators to be connected to a feeder with the generators at the time connected to such feeder and according to one feature of the invention a signal is transmitted back to the control `station indicative of the fact that the generator associated with the circuit breaker to be operated is in phase with the generators at the time which are connected to the feeder, this signal being transmitted subsequent to the selection of the circuit breaker and prior to its operation.

According to a further feature of the invention after the selection of the circuit breaker has been effected a signal indicating that the circuit breaker may be operated is only transmitted to the control station when the associated generator of the selected circuit breaker comes into phase with the generators connected to the feeder.

According to a still further feature of the invention for the purpose of determining when the associated generator of the selected circuit breaker is in phase with the generator connected to the feeder a circuit breaker already connected to the feeder is selected by the same train of impulses which selects the unconnected circuit breaker.

'Ihe invention is illustrated by way of example in the accompanying drawings comprising Figs. 1 and 2 which should be arranged with Fig. 1 to the left of Fig. 2 to form a complete circuit.

Before commencing the description of the detailed circuit operations, it should be explained that the system about to be described employs four wires between the control station Fig. 1 and the substation Fig. 2, two of which are used in connection with the transmission of signals for selecting the required apparatus, while the other two conductors are used subsequently in connection with the transmission of signals for controlling the apparatus selected.

At the control station the selecting signals transmitted to the substation are controlled by a single motion rotary switch which makes one complete revolution for each selecting operation, while the nature of the impulses delivered are determined by a group of keys connected to the bank contacts.

At the substation four single motion rotary switches are provided arranged to function in pairs, that is to say, one switch of each pair is set to a selecting position in accordance with the impulses received, While the other switch in each l pair is arranged to count off the remainder of the impulses in the train to check that the correct number is received. A xed complement of impulses is delivered during each selecting operation and these are sub-divided in a known manner to effect the correct selection. 5 The rotary switches illustrated are the same as those commonly used in automatic telephony and the structure thereof is shown on page 51 of the second edition of Automatic Telephony published in 1921 by Smith & Campbell. A switch of this type may have a plurality of wipers on a common shaft each rotatable over a series of bank contacts individual to it. The wipers are rotated together and may be set at any position so as to engage the contact of its bank after one step or after twenty-uve steps. The wipers le to 5e, inelusive, of switch SSW are all rotated together on a common shaft by magnet SSM. The wipers 2e and 4e of switch SSW have a diiferent normal position than the other wipers of the switch and 0 do not engage a contact of their banks until the switch magnet has taken twenty-five steps. The contacts of the banks of wipers 3e, 4e, 5e, 2d, 2c, 4c, 2b, and 3b are shown as a straight line which indicates that all except the rst contact are con- 2 nected together or in practice may be a single strip of contact metal so that in the twenty-five steps the circuit is continuously closed.

Considering now the detailed circuit operation, if it is assumed that circuit breaker No. IQ

is to be closed and, before operation, the associu ated generator is to be synchronized with the generator of circuit breaker No. l which is already connected to the feeder, then key No. I shown in Fig. 1 will be operated to its synchro- 35 nizing position while key No. ID is moved to the operating position. By this means two contacts in the bank of the 50 point selecting switch SSW are marked by the removal of positive potential therefrom, while at the same time positive potential is connected to the common conductor l0 thereby completing a circuit for operating relay E in series with the driving magnet SSM. The circuit extends as follows: positive potential through the operate springs of the No. It] key to conductor it), wiper 3e and home contact of switch SSW, armature k3 relay E, interrupter springs ssm of magnet SSM, opened when said magnet is operated, magnet SSM to negative potential. A branch circuit is also completed via armature kd for operating relay CO. Owing to the comparatively high resistance of relay E the driving magnet SSM is not operated, but relay E operates the armature el to close a direct circuit for the magnet which in turn energizes to open the circuit of relay e at interrupter springs and the two are caused to interact with each other so that the wipers of the switch SSW are automatically advanced around the banks in search of the markings eiected over keys No. I and II). All wipers of switch SSW rotate counter-clockwise and as the switch rotates the wiper Ie moves step by step over its contacts to iind the contact marked by the absence of potential due to the operation of key No. I in synchronized position before wiper 2e engages any of its contacts. Relay CO in operating at armatures col and co2 connects up the correct signalling potential, and conveniently relay E is provided with the armature e2 located in the signalling circuit to the substation so that an impulse is delivered to the substation by contacts e2 over the seriesv circuit for each step of the switch SSW.

Relay K is operated on the first step of the switch over wiper 3e from positive potential on conductor Ill, wiper 3e, connected contacts in the banksl of 3e and ile, and lower winding of rel-ay K to negative battery, and thereupon locks over its upper winding to earth on the common conductor III.Y Relay K moreover at armature k2 prepares the receiving circuit comprising relays S and NS which is operative later, and at armatures k3 and kil opens the initial energizing circuit to relays E and CO which are now operated over the wipers of the switch SSW.

At the substation only the polarized relay N, Fig. 2, responds to the impulses of the polarity connected up when CO and E are energized and at arm-ature nI completes a circuit over the wiper 2b of the switch B in its first position to the driving magnet AM, thereby advancing the wipers of the switch A in synchronism with Vthose of the switch SSW at the control station.

Relay N moreover at armature n2 brings up the slow releasing relay SL which by reason of its copper slug, illustrated by its lower cross-hatched portion, remains energized throughout the irnpulsing period, and at armature sli holds open a checking circuit which will become operative Y later.V

When wiper le of the switch SSW at the control station encounters the first marking, relay CO is released by the absence of positive potential on the contact,'and at armatures col and co2 reverses the potential on the signalling leads so that the polarity of the next pulse delivered will be of a sense such as to operate the polarized relay R at the substation. Relay R at Varmature ri completes a circuit over wiper 3b of the switch B in its iirst position to the driving magnet BM, so that the wipers of this switch are moved into their second position and as a result the remaining impulses of the iirst 25 are effective in setting the wipers of the B switch to a certain position. It will be appreciated that relay CO is re-operated when the wiper Ie leaves the marked contact and consequently the remaining impulses referred to are of normal polarity and are received on the polarized relay N. The circuit for irnpulsing magnet BM extends over wiper 2b and bank contact of switch B and wiper 2c and iirst Ybank cont-act of switch C. Relay R moreover at armature r2 provides an alternative holding circuit for relay SL so as to maintain the'checking circuit disconnected while the impulse of opposite polarity is being received.

When the wipers of the switch SSW at the control station come into their 25th position wiper Ie encounters a disconnection, whereupon relay CO again releases and as a result the 25th impulse is delivered in reversed polarity so as to operate relay'R and efect the changeover on to the C switch at the substation in accordance with the slip stepping arrangement already described. This change is accomplished by a single energization of magnet CM of switch C over a circuit from positive potential through contacts r', wiper 3b and its contacts, wiper 4c and its normal contact, and magnet CM to negative potential. The wipers of switch C are thus moved one step to connect the 'n' springs to the magnet CM of the C switch. Rel-ay E is now operated by positive potential extended over wiper le instead of 3e and further impulses are eiective to operate' relay N and are received on the C switch, the circuit for magnet CM extending from springs n via wipers 2b, 2c, and 2d of the switches B, C, and D. When Wiper 2e of the switch SSW encounters the contact marked from key Il] in its operating position another reversed impulse is delivered, so as to effect transfer on to the D switch at the substation and this switch responds to the remaining impulses of the second 25.

The reverse impulse again operates relay R which at springs sends an impulse to magnet DM of switch D to step it from its normal position,

. the circuit including springs r', wiper 3b and its bank contacts, wiper fic and its bank contacts, and magnet DM to negative potential. The switch D is operated one step and prepares a circuit over which subsequent energizations of relay N will operate switch D. This switch includes springs n', wiper 2b and bank contacts, wiper 2c and bank contacts, wiper 2d and contacts, and magnet DM to negative potential.

When the wipers of the switch SSW at the control station again arrive in their first position, the driving circuit is opened to the magnet SSM and relay E when the wiper lie leaves the common plate, and as relay K remains operated from earth on the common conductor I0 the wipers are held against further rotation. The receiving circuit comprising the polarized relays S and NS is now connected up over wiper 5e in its rst position and the operated armature k2. Y

At the substation a checking arrangement to prove the reception of the full complement of impulses, is provided by way of banks on the switches A, B, C, and D which are connected back to back in pairs in the manner shown. If it is assumed that the impulses are correctly received then upon the release of the slow relay SL, a series circuit is completed by way of the banks and wipers la, Ib', Ic, and ld for operating the checking relay CH, which at armature chl completes circuits over the banks and wipers 2a and 3c of the switches A and C for operating the connecting relays IM and ION. By this means, at armature Im! and Im2 the potential transformer of circuit breaker No. I (POTI) already closed to the feeder, is connected to one side of the synchronizing relay SNR, while at armatures i011! an-d lilnZ the potential transformer associated with circuit and as relay RV is normal during this period the potential connected back over the signalling leads by the operation of armature C712 will be of a sense such as to operate the polarized relay NS at the main station, which at armature 118| lights the not synchronized lamp NSL in view of the attendant.

When both potential transformers come into phase the synchronizing relay operates and in turn brings up relay RV, which at armatures To! and rc2 reverses the direction of potential over the signalling leads to operate the polarized relay S at the main station. Relay S at armature si lights the synchronized lamp, and at armatures s2 and s3 prepares the circuit for the operating keys.

The circuit breakers are not shown and may be of any well known type such as illustrated by Wensley Patent No. 1,726,131, each breaker having a pair of relays shown herein as CIR, No. l and TIR No. l, one for closing the breaker and the other for -opening it. The output from each breaker is connected to a transformer such as POT.I to POTJO for synchronizing purposes.

The attendant at the main station on seeing the synchronized lamp light will then operate the close key, thereby connecting potential over the operating wires of a sense such as to operate the polarized relay CL Fig. 2, at the substation, which at armature cli connects positive potential to wiper 6c and bank contact of the switch C for operating No. l!) of the close interposing relays CIR in order to bring about the mechanical movement of circuit breaker No. I0 to its closed position. It will be understood that the trip and close relays CIR No. I0 and TIR No. I0 have been selected by the wipers 6c and 5c of switch C when thus switch was -operated in synchronism with the last half of the operation of switch SSW when it operated step by step to ind the contact marked by key No. I0 in the bank of wiper 2e.

In case it should be desired to trip the circuit breaker selected, this may be effected by the depression of the trip key at the main station which connects signalling potential to the operating conductors of a sense such as to operate the polarized relay TR at the substation, which in turn at armature trl completes a circuit over the wiper an-d bank 5c for operating one of the trip interposing relays TIR.

Homing circuits have not been shown for the various switches at the substation since these form no part of the present invention and are readily conceivable to those skilled in the art.

What we claim as new and desire to secure by Letters Patent is:

1. In a remote control system, a control and a remote station, an electrical system and feeders for supplying current thereto located in the remote station, circuit breakers associated with each feeder, phase determining means in the remote station, a signalling circuit connecting the stations, means in the control station for transmitting impulses of different polarities over the circuit to select a breaker and connect the associated feeder to the phase determining means, and means in the remote station for reversing the direction of current flow in said circuit when the current in the selected feeder is in synchronism with the current in the electrical system to signal the attendant at the control station and permit operation of the selected breaker.

2. In a control system, a feeder circuit and generators for supplying current thereto, a circuit breaker associated with each generator, phase determining means, a signalling circuit, means for transmitting impulses over the signalling circuit, means responsive to the transmitted impulses for selecting a circuit breaker and for connecting the associated generator to the phase determining means, means controlled by said phase determining means when the current of said connected generator is in synchronism with the current in the feeder circuit for transmitting a signal back over said signalling circuit, a common operating circuit for all said circuit breakers, and means operated in response to said transmitted signal for preparing said common operating circuit to permit operation of the selected circuit breaker.

3. In a control system, a feeder circuit and generators for supplying current thereto, a circuit breaker associated with each generator for connecting such generator to the feeder circuit, one of said circuit breakers being closed thereby connecting its associated generator to the feeder circuit, a phase determining means, a potential transformer connected to the output of each of said generators, a signalling circuit, means for transmitting impulses over said signalling circuit, means responsitve to the transmitted impulses for selecting a circuit breaker preparatory to connecting its associated generator to the feeder circuit, for automatically connecting the phase determining means to the potential transformer connected to the output of the generator associated with the selected circuit breaker, and for automatically connecting the phase determining means to the potential transformer connected to the output of said generator connected to said feeder circuit, means controlled by said phase determining means when the output current of the corresponding selected generator is in synchronism with the output current of the generator in the feeder circuit for transmitting a signal back over said signalling circuit, and means operated by said signal for thereafter permitting the operation of the selected circuit breaker.

4. In a remote control system, a control and a remote station, a feeder circuit and generators for supplying current thereto in the remote station, a circuit breaker associated with each generator for connecting such generators to the feeder circuit, one of said circuit breakers being closed thereby connecting its associated generator to the feeder circuit, phase determining means in the remote station, a signalling circuit connecting said stations, means in the control station for transmitting a single code of impulses over the signalling circuit to the remote station, said code corresponding to a circuit breaker to be selected for operation and corresponding to said one closed circuit breaker already connecting its associated generator to the feeder circuit, means in said remote station responsive to said transmitted impulses for selecting a particular one of said circuit breakers in accordance with said code of impulses preparatory to operating the selected circuit breaker and connecting its associated generator to said feeder circuit, means in the remote station also responsive to said code of impulses for connecting the said corresponding selected generator to said phase determining means, means in the remote station also responsive to said code of impulses for connecting the phase determining means to the generator connected to the feeder circuit by said closed circuit breaker, and means controlled by said phase determining means when the current of the corresponding selected generator is in synchronism with the current of the generator in the feeder circuit for thereafter permitting the operation of the said selected circuit breaker.

5. In a control system, a feeder circuit and generators for Vsupplying current thereto, a circuit breaker associated With each generator for connecting such generator to the feeder circuit, one of said circuit breakers being closed thereby connecting its associated generator to the feeder circuit, means for selecting any circuit breaker preparatory to connecting its associated generator to the feeder circuit, a phase determining means, a potential transformer connected to the output of each of said generators, means controlled in response to said selection for automatically connecting the phase determining means to the po tential transformer connected to the output of the generator associated with the selected circuit breaker, means also controlled in response to said selection for automatically connecting the phase determining means to the potential transformer connected to the output of said generator connected to saidjfeeder circuit, and means controlled by the phase determining means when the output current of the corresponding selected generator is in synchronism with the current of said connected generator in the feeder circuit to permit operation of the selected circuit breaker.

GEORGE ARTHUR BURNS. PERCY FRANK GUNNING. 

